Which of the following types of motor enclosure is safest ?

Related Mcqs:

1. ________________ motor is a constant speed motor?

   A. Synchronous motor B. Schrage motor C. Induction motor D. Universal motor...

2. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is____________________?

   A. slop speed operation B. high starting torque C. low windage losses D. all of the above...

3. The starting torque of a D.C. motor is independent of which of the following?

   A. Flux B. Armature current C. Flux and armature current D. Speed...

4. For blowers which of the following motor is preferred ?

   A. D.C. series motor B. D.C. shunt motor C. Squirrel cage induction motor D. Wound rotor induction motor...

5. Which of the following is essentially needed while selecting a motor ?

   A. Pulley B. Starter C. Foundation pedal D. Bearings...

6. In which of the following applications the load on motor changes in cyclic order ?

   A. Electric shovels B. Cranes C. Rolling mills D. All of the above...

7. For a motor-generator set which of the following motors will be preferred ?

   A. Synchronous motor B. Slip ring induction motor C. Pole changing induction motor D. Squirrel cage induction motor...

8. In series motor which of the following methods can be used for changing the flux per pole ?

   A. Tapped field control B. Diverter field control C. Series-parallel control D. Any of the above...

9. For a D.C. shunt motor which of the following is incorrect ?

   A. Unsuitable for heavy duty starting B. Torque varies as armature current C. Torque-armature current is a straight line D. Torque is zero for zero armature current...

10. While selecting motor for an air conditioner which of the following characteristics is of great importance ?

    A. Type of bearings B. Type of enclosure C. Noise D. Arrangement for power transmis¬sion E. None of the above...